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https://issues.apache.org/jira/browse/MAPREDUCE-4061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238851#comment-13238851
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Robert Joseph Evans commented on MAPREDUCE-4061:
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The patch looks simple enough, and looks like it does what we want. +1
> RM only has 1 AM launcher thread
> --------------------------------
>
> Key: MAPREDUCE-4061
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4061
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.2
> Reporter: Thomas Graves
> Assignee: Thomas Graves
> Priority: Critical
> Attachments: MAPREDUCE-4061.patch
>
>
> The application master launcher has a thread pool that is configured with
> core size 1, maximum 10. The thread pool will not create over
> the core size thread unless the queue it is using is full. We are using an
> unbounded queue, so the thread pool will only ever create 1 thread. We need
> to have more then 1 AM launch thread.
> If that thread becomes hung for some reason, the RM can no longer launch any
> application masters. We have seen an instance of this when a NM become
> unresponsive - something bad happened to host, not sure what yet.
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